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- W2004964945 abstract "Methyl β-D-glucopyranoside tetraacetates (1) having a trideuterioacetyl group at O-2 (1a), O-3, (1b), O-4 (1c), and O-6 (1d) were synthesized by unambiguous routes to permit assignment of each individual acetoxyl-group signal in the p.m.r. spectrum of 1. The 6-acetoxyl resonance appears at lower field than signals of the other acetoxyl groups in carbon tetrachloride, chloroform-d, and methyl sulfoxide-d6, but in pyridine-d5 and benzene-d6, the 2-acetoxyl-group signal appears at lower field. The acetoxyl resonances of methyl 2,3,4-tri-O-acetyl-6-O-trityl-β-D-glucopyranoside (2), methyl 2,3,4-tri-O-acetyl-β-D-glucopyranoside (3), methyl 2,3-di-O-acetyl-4,6-O-benzylidene-β-D-glucopyranoside (5), methyl 2,3-di-O-acetyl-β-D-glucopyranoside (6), methyl 2,3,6-tri-O-acetyl-β-D-glucopyranoside (7), and methyl 2,3-di-O-acetyl-6-O-trityl-β-D-glucopyranoside (12) were assigned similarly after synthesis of the 2-(trideuterioacetyl) (2a, 3a, 5a, 6a, 7a, and 12a), 3-(trideuterioacetyl) (2b, 3b, 5b, 6b, 7b, and 12b), 4-(trideuterioacetyl) (2c and 3c), and 6-(trideuterioacetyl) (7c) analogues. In chloroform-d and benzene-d6, the 4-acetoxyl resonance appeared at about 0.3 p.p.m. to higher field than the other acetoxyl-group signals of 2. In chloroform-d and methyl sulfoxide-d6, the 3-acetoxyl resonance is observed at highest field in compounds 1, 3, and 5. In all of these instances, the 4-hydroxyl group is substituted by an acetyl or benzylidene group. When no 4-substituent is present (compounds 6, 7, and 12), the 3-acetoxyl group resonates at lower field than the other acetoxyl groups." @default.
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- W2004964945 title "Specific spectral assignments for acetoxyl-group resonances in proton magnetic resonance spectra of methyl β-D-glucopyranoside tetraacetate and related derivatives" @default.
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- W2004964945 doi "https://doi.org/10.1016/s0008-6215(00)83968-3" @default.
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